12a6b7db3Sskrll // compressed_output.h -- compressed output sections for gold -*- C++ -*- 22a6b7db3Sskrll 3*cb63e24eSchristos // Copyright (C) 2007-2024 Free Software Foundation, Inc. 42a6b7db3Sskrll // Written by Ian Lance Taylor <iant@google.com>. 52a6b7db3Sskrll 62a6b7db3Sskrll // This file is part of gold. 72a6b7db3Sskrll 82a6b7db3Sskrll // This program is free software; you can redistribute it and/or modify 92a6b7db3Sskrll // it under the terms of the GNU General Public License as published by 102a6b7db3Sskrll // the Free Software Foundation; either version 3 of the License, or 112a6b7db3Sskrll // (at your option) any later version. 122a6b7db3Sskrll 132a6b7db3Sskrll // This program is distributed in the hope that it will be useful, 142a6b7db3Sskrll // but WITHOUT ANY WARRANTY; without even the implied warranty of 152a6b7db3Sskrll // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 162a6b7db3Sskrll // GNU General Public License for more details. 172a6b7db3Sskrll 182a6b7db3Sskrll // You should have received a copy of the GNU General Public License 192a6b7db3Sskrll // along with this program; if not, write to the Free Software 202a6b7db3Sskrll // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 212a6b7db3Sskrll // MA 02110-1301, USA. 222a6b7db3Sskrll 232a6b7db3Sskrll // We support compressing .debug_* sections on output. (And, 242a6b7db3Sskrll // potentially one day, other sections.) This is a form of 252a6b7db3Sskrll // relaxation. This file adds support for merging and emitting the 262a6b7db3Sskrll // compressed sections. 272a6b7db3Sskrll 282a6b7db3Sskrll #ifndef GOLD_COMPRESSED_OUTPUT_H 292a6b7db3Sskrll #define GOLD_COMPRESSED_OUTPUT_H 302a6b7db3Sskrll 312a6b7db3Sskrll #include <string> 322a6b7db3Sskrll 332a6b7db3Sskrll #include "output.h" 342a6b7db3Sskrll 352a6b7db3Sskrll namespace gold 362a6b7db3Sskrll { 372a6b7db3Sskrll 382a6b7db3Sskrll class General_options; 392a6b7db3Sskrll 40be12b8bcSchristos // Read the compression header of a compressed debug section and return 41be12b8bcSchristos // the uncompressed size. 42be12b8bcSchristos 43be12b8bcSchristos extern uint64_t 44be12b8bcSchristos get_uncompressed_size(const unsigned char*, section_size_type); 45be12b8bcSchristos 46be12b8bcSchristos // Decompress a compressed debug section directly into the output file. 47be12b8bcSchristos 48be12b8bcSchristos extern bool 49be12b8bcSchristos decompress_input_section(const unsigned char*, unsigned long, unsigned char*, 509573673dSchristos unsigned long, int, bool, elfcpp::Elf_Xword); 51be12b8bcSchristos 522a6b7db3Sskrll // This is used for a section whose data should be compressed. It is 532a6b7db3Sskrll // a regular Output_section which computes its contents into a buffer 542a6b7db3Sskrll // and then postprocesses it. 552a6b7db3Sskrll 562a6b7db3Sskrll class Output_compressed_section : public Output_section 572a6b7db3Sskrll { 582a6b7db3Sskrll public: Output_compressed_section(const General_options * options,const char * name,elfcpp::Elf_Word flags,elfcpp::Elf_Xword type)592a6b7db3Sskrll Output_compressed_section(const General_options* options, 602a6b7db3Sskrll const char* name, elfcpp::Elf_Word flags, 612a6b7db3Sskrll elfcpp::Elf_Xword type) 622a6b7db3Sskrll : Output_section(name, flags, type), 632a6b7db3Sskrll options_(options) 642a6b7db3Sskrll { this->set_requires_postprocessing(); } 652a6b7db3Sskrll 662a6b7db3Sskrll protected: 672a6b7db3Sskrll // Set the final data size. 682a6b7db3Sskrll void 692a6b7db3Sskrll set_final_data_size(); 702a6b7db3Sskrll 712a6b7db3Sskrll // Write out the compressed contents. 722a6b7db3Sskrll void 732a6b7db3Sskrll do_write(Output_file*); 742a6b7db3Sskrll 752a6b7db3Sskrll private: 762a6b7db3Sskrll // The options--this includes the compression type. 772a6b7db3Sskrll const General_options* options_; 782a6b7db3Sskrll // The compressed data. 792a6b7db3Sskrll unsigned char* data_; 802a6b7db3Sskrll // The new section name if we do compress. 812a6b7db3Sskrll std::string new_section_name_; 822a6b7db3Sskrll }; 832a6b7db3Sskrll 842a6b7db3Sskrll } // End namespace gold. 852a6b7db3Sskrll 862a6b7db3Sskrll #endif // !defined(GOLD_COMPRESSED_OUTPUT_H) 87